Minitab evaluates the resulting test plans and displays the best plans with respect to minimizing the standard error of the parameter of interest. By default, Minitab displays three test plans. The first best optimum allocations test plan is the one with the smallest variance.
Minitab also displays the second and third best optimum allocations of test units. If little difference exists in the standard error of the parameter of interest across test plans, choose the plan that would yield more failures or is the least expensive to execute.
The estimated standard error of the 1000-hour reliability is 0.0123437.